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8.20” Less Annular Space Clearance -1.00” 7.20” Divide this number (7.20”) by 2 to obtain the total allowable runner height = 3.60” C. Choose a runner height of this value or less. Verify Runner Height Selection will clear bell. Solution: Use AZ2-90 (Runner Height = 3-1/2”) Note: This combination will restrain the pipe from flotation within the casing pipe by allowing only about 1.6” of clearance between the top runners and the casing I.D. This will center the carrier pipe within approximately 0.8” of exact center. Just Clear the Bell - S (suggested minimum clearance is at least 0.8” (0.4” on both sides) 9.05” C-900 pipe (9.05” O.D. barrel & 11.5” O.D. bell) inside a 18” casing with a 0.375” wall thickness. Determine minimum runner height. (Just to Clear Bell.) Bell O.D. 11.5” Add 0.8” Clearance +0.80” 12.30” Less Barrel O.D. -9.05” 3.25” Divide this number (3.25”) by 2 to obtain the minimum runner height to just clear the bell = 1.62” Choose a runner height between 1.62” and the maximum allowable runner height (3.60”) determined in the above example. Solution: Use AZ2-55 (Runner Height = 2-1/4”) How To Order Model AZ Casing Isolators/Spacers Nominal Pipe Diameter O.D. Range Segments Per Spacer AZ1 Model Number Runner Height (Inches) 4" 3.85"-5.10" 3 - AZ1 AZ1-16 AZ1-25 AZ1-36 AZ1-55 AZ1-75 AZ1-90 AZ1-110 5/8" 1" 1-1/2" 2-1/4" 3" 3-1/2" 4-1/2" 6" 5.10" -6.90 4 - AZ1 6" 6.37" - 8.50" 5 - AZ1 Nominal Pipe Diameter O.D. Range Segments Per Spacer AZ1 Model Number Runner Height (Inches) 8" 7.99" - 9.05" 3 - AZ2 AZ1-16 AZ1-25 AZ1-36 AZ1-55 AZ1-75 AZ1-90 AZ1-110 5/8" 1" 1-1/2" 2-1/4" 3" 3-1/2" 4-1/2" 10" 10.23" - 12.20" 4 - AZ2 12" 11.88" - 13.75" 4 - AZ2 & 1 - AZ1 Following are examples on how to size AZ Casing Spacers for various applications. For exact centering and adjusting for grade elevation changes contact PSI. How to Size your Installation Application (Examples) Centered & Restrained with Equal Length Runners - C 9.05” C-900 pipe (9.05” O.D. barrel & 11.5” O.D. bell) inside a 18” casing with a 0.375” wall thickness A. Find carrier pipe O.D. (9.05”) and choose the proper size and number of segments. One spacer would require 3 AZ2 Segments B. Determine maximum runner height with equal length runners. Casing I.D. 17.25" Less Carrier Pipe O.D. -9.05”   8.20" Less Annular Space Clearance -1.00"   7.20"